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be动词的意思
be动词意思和用法很多，一般的意思是：是，此种用法，有多种变化形式，is，am，are，was，were，being，been，to be.另外，be动词还有成为的意思。根据句子中不同的人称、数和时态，应该选择相应的be动词。
要看句语的时态:
如果是一般过去时,就用was/were
如果是一般现在时,就用am/is/are
如果是一般将来时,就用will be
然后看主语的人称及复数形式:
一般过去时：
第一人称和第三人称的单数形式，则用was
第一人称和第二人称、第三人称的复数，则用were
一般现在时：
第一人称单数形式，用am
第三人称单数形式，用is
第一人称和第二人称、第三人称的复数形式，则用are
一般将来时：
will be
口诀：
一般时态有关be动词的口诀
我用am，你用are，is连接他/她/它，单数名词用is，复数名词全用are
变疑问，往前提，句末问号莫丢弃
变否定，更容易，be后not莫忘记
疑问否定任你变句首大写莫迟疑
be动词的用法
be（be/is/are/am/was/were)
[bi:]
vi
现在时 I am, you are, he is, we are, you are, they are（缩略式 I'm, you're, he's, we're, you're, they're）,（否定缩略式 I'm not, isn't, aren't），过去时 I was, you were, he was, we were, you were, they were（过去时否定缩略式 wasn't, weren't）过去分词been
现在分词being
英语的“be”是个特殊动词；有些语言，如马来文等，并没有“be”这样的动词。
“Be”除了原形的“be”之外，还有另外七种形式：am, is, are, been, being, was, were.在句子中，“be”可以是系动词或助动词系动词，所构成的句子结构为主系表，表现形式有：is, am, are, was, were，在句子中翻译为“是”
eg：
I am a girl.我是个女孩。助动词，无实际意义，与其他动词一起构成时态。表现形式有：is, am, are, was, were以及Be原形。eg：
I am reading.我正在看书。（进行时）
例句对照
当主动词时，“be”在性质上属于接系动词(The Linking Verb), 后面要有名词、形容词、地方副词或短语作补足语(The Complement)
eg：
1.The man is a science teacher.这个男子是一位科学教师
2.Mary's new drees are colourful.玛丽的新衣服色彩鲜艳
3.I have been there before.我以前去过那里
4.My mother is in the kitchen now.母亲现在在厨房
这四个都是陈述句，可以变成疑问句，方法简单，把主语和“be”或助动词对换位置即可
eg：
5.Is the man a science teacher?
6.Are Mary's new drees colourful?
7.Have I been there before?
8.Is mother in the kitchen now?
当“be”要在祈使句中出现时，它必须借助 助动词“do”或“don't”之助
eg：
9.Don't be silly!
10.Do be obedient!
11.Don't be a fool!
“Be”有两种缩写法，eg：
12.He's not...../He isn't....13.You're not...../You aren't...但“am + not”的缩写法只有一个：
eg：
14.I'm not.有人用“ain't”, 但这并不是标准英语。
谈过了“be”作主动词的功能，现在看看“be”作助动词时，有些什么用法：
【1.】“Be + 现在分词”以组成进行式时态(Continuous Tenses)
eg：
15.Tony's maid is washing his new car.16.The children are playing in the field.17.Samuel was eating when I came in.18.We have been living here since 1959.【2.】“事/物人 +Be + 过去分词”以组成被动语态(The Paive Voice)
eg：
19.Her money in the drawer was stolen
20.A number of good jobs are taken up by foreigners
21.David studied in Taiwan but has been trained as a language lecturer in America
22.Can all the wonderful birds be found in our Bird Park
23.The disobedient boy was told to stand out-side the claroom
24.Steps are being taken to reduce traffic con-gestion during peak hours
25.Dishonest students will be immediately dealt with
练习
一用be动词适当的词填空
1.I ________ from Australia.2.She _______ a student.3.Jane and Tom _________ my friends.4.My parents _______ very busy every day.5.I ______ an English teacher now.6.Where _________ you from?
7.The light _________ green.8.My name is _________ Li Dong.9.I _________ twelve.10._________ they your new friends?
11.I ______ a boy.12.______ you a boy? No, I _____ not.13.The girl______ Jack's sister.14.The dog _______ tall and fat.15.______ your brother in the claroom?
16.Where _____ your mother? She ______ at home.17.Whose dre ______ this?
18.That ______ my red skirt.19.The books_______under the table.20.Who ______ I?
21.Some tea ______ in the gla.22.Gao shan's shirt _______ over there.23.My sister's name ______Nancy.24.This ______ not Wang Fang's pencil.25.______ David and Helen from England?
26.We ____ friends.27.She ___ a teacher.28.I ___ a girl.29.Many ants ____ in my house.30.His mother ____ fat.31.He _____ in Cla 4, Grade 1.32.What _____ your name?
33.These _____ buses.34.What cla _____ you in?
35.It_____ a car.36.Helen____ a student
37.This _____my book.38.My father______a cook.39.Jack’s friend____in Cla One.40.You ____ a doctor.41.They ____ cars.42.That______her dog.43.The cat_______on the desk.二.选择
1.She ______ Mi Hen.A.be
B.am
C.is
2.I ______ sorry.A./
B.am
C.are
3.Here ______ my ball.A.is
B.are
C.am
4.You ______ number eight.A.are
B.is
C.am
5.What_______this.A.is
B.are
C.be
6.Helen____ a student.A.be
B.am
C.is
7.Those _____oranges.A.is
B.are
C.am
8.How old _____your teacher?
A.be
B.am
C.is
9.Where __ ___ her mother?
A.are
B.is
C.am
10.The two cups of milk _____ for me.A.is
B.are
C.be
11.Eric and Kathy ____ my students.A.are
B.is
C.am
12.Your books ____ not good.A.is
B.are
C.be
13.He ___ a boy.A.be
B.am
C.is
14.It ___ my dog.A.is
B.are
C.be
15.Whose socks ______ they?
A.are
B.is
C.am
16._______ there any chairs in the claroom.A.Is
B.Are
C.Am.The man with big eyes _______ a teacher.A.be
B.am
C.is
18.How _______ your father?
A.is
B.are
C.be
19.Mike and Liu Tao ______ at school.A.are
B.is
C.am
20.I _____
a student.A.be
B.am
C.is
21.They ______ teachers.A.is
B.are
C.be
22.This_____my mother.A.are
B.is
C.am
23._____ you a student? Yes,I am.A.Am
B.Is
C.Are
24.The jam _____ good for my grandma.A.is
B.are
C.b
三.将下列句子变成否定句和一般疑问句
1.His brother is a teacher.否定句:
一般疑问句:
2.Those are his parents.否定句:
一般疑问句:
3.I’m 14 years old.否定句:
一般疑问句:
4.The ruler is on the table.否定句:
一般疑问句:
5.Tom is my teacher.否定句:
一般疑问句:
6.My shoes are 20 yuan.否定句:
一般疑问句:
7.This is a pen.否定句:
一般疑问句:
8.My name is Andy.否定句:
一般疑问句:
9.We are twins.否定句:
一般疑问句:
10.He is my brother.否定句:
一般疑问句:
11.I am a teacher.否定句:
一般疑问句:
12.She is my mother.否定句:
一般疑问句:
13.This is Mi Zhao.否定句:
一般疑问句:
14.She is a new student.否定句:
一般疑问句:
15.Tom is my best friend.否定句:
一般疑问句:
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